Mention executables (scylla, tools and tests) as well as how to build
individual object files and how to verify individual headers. Also
mention the not-at-all obvious trick of how to build tests with debug
symbols.
Signed-off-by: Botond Dénes <bdenes@scylladb.com>
Message-Id: <20210416131950.175413-1-bdenes@scylladb.com>
This adds a "help" build target, which prints out important build
targets. The printing is done in a separate shell script, becaue "ninja"
insists on print out the "command" before executing it, which makes the
help text unreadable.